chore: update Coder messaging on README

[bpmct]

We are working on an open source project which adds multi-user and workspace support with code-server.

[github-actions]

✨ code-server docs for PR #5268 is ready! It will be updated on every commit.

• Host: https://coder.com/docs/code-server/e1f94bb
• Last deploy status: success
• Commit: 6a50956
• Workflow status: https://github.com/coder/code-server/actions/runs/2496610630

[codecov]

Codecov Report

Merging #5268 (6a50956) into main (a96162d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5268   +/-   ##
=======================================
  Coverage   72.12%   72.12%           
=======================================
  Files          30       30           
  Lines        1668     1668           
  Branches      367      367           
=======================================
  Hits         1203     1203           
  Misses        399      399           
  Partials       66       66           

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[github-actions]

✨ code-server dev build published to npm for PR #5268!

• Last publish status: success
• Commit: 6a50956

To install in a local project, run:

npm install @coder/code-server-pr@5268

To install globally, run:

npm install -g @coder/code-server-pr@5268